Device for exhausting broken threads in spinning machines



Nov. 29, 1955 J. FURSTENBERG 2,724,943

DEVICE FOR EXHAUSTING BROKEN THREADS IN SPINNING MACHINES Filed July 10,1951 2 Sheets-Sheet l N 31 7.1 5; 3 fill 55p. 7

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IN VEN TOR.

J'UAL'HJMFUR SQENBERE' Nov. 29, 1955 J, FURSTENBERG 2,724,943

DEVICE FOR EXHAUSTING BROKEN THREADS IN SPINNING MACHINES Filed July 10,1951 2 Sheets-Sheet 2 .i/g. J9

INVENTOR.

JbAE'HfMFZ/RSTEMBERG DEVICE FOR EXHAUSTING BROKEN THREADS IN SPINNINGMACHINES Joachim Fiirstenherg, Esslingen (Neckar), Germany, as-

signor to Pneumafil Corporation, Charlotte, N. (1., a corporation ofDelaware Application July 10, 1951, Serial No. 235,967 16 Claims. o1.57-345 This invention relates to devices for exhausting broken threadsin spinning machines. Devices for exhausting broken threads in spinningmachines are generally well known today. They can also be utilized,without substantial alteration, for fly-frames.

In principle, two main requirements are imposed in the exhausting ofbroken threads, on the way in which the air current is caused to act:

(1) The catching and exhausting of a broken thread in any positionoccurring during the change motion along the drawing frame;

(2) The freeing of the lower delivery roller of the drawing frame fromdust and lose fibres.

By reason of its comparatively greater volume, the exhausting of athread is easier to achieve than the exhausting of individual loosefibres which, in addition, tend to adhere more firmly to the flutedroller of the drawing frame. The suction efiect must, therefore, notonly be sufficiently strong and extend over the entire change motionnecessitating by the guiding of the yarn but, especially in view of thelast mentioned requirement, it must also bring about an optimum aircirculation round the fluted roller.

A further problem in this connection resides in the fact that in theevent of broken threads, which occur between the guide eyelet and thering rail, the thread often becomes twisted in the guide eyelet as theresult of the twist imparted to it.

In that case, by means of a properly arranged thread exhausting device,the thread will, it is true, be caught up between the drawing frame andthe guide eyelet and the yarn subsequently delivered by the drawingframe continue to be delivered; when the broken thread becomes twistedin the guide eyelet, however, an end of yarn frequently hangs betweenthe eyelet and the nozzle and extends into the latter and in the nozzlesof the existing type the continued delivery from the drawing frame maylead to the exhaust tube becoming choked by fibres.

In order to allow for all the above-mentioned problems and thuseliminate the existing difliculties, according to the invention thenozzle outlet of such exhaust tubes exhibits, at least substantially,the basic shape of a triangle which theoretical considerations andpractical tests have shown to be the most advantageous.

At the same time, in utilizing the triangular cross section, it isparticularly advantageous to select an isosceles triangle, the apex ofwhich is turned towards the drawing frame roller which primarily mostoften needs to be cleaned, that is to say towards the fluted roller. Itis also advisable slightly to round oif the corners of such a nozzleoutlet.

Moreover, it is also possible, within the scope of the invention,likewise to promote the suction air circulation round the pressureroller located above the fluted roller of the drawing frame, if,depending upon the position of the said roller relatively to the flutedroller, the nozzle is arranged obliquely to the longitudinal axis of thenozzle States Patent 2,724,943 Patented Nov. 29, 1955 tube. Finally, thenozzle can be brought as close as possible to the fluted roller andhence also to the bite or nip formed between fluted roller and pressureroller, by providing a suitable recess in the nozzle tube adjacent tothe nozzle outlet and on the side of its peripheral curvature nearesttothe fluted roller.

The accompanying drawing. shows on the one hand, a number ofknown'nozzles with their corresponding conditions of flow and, on theother hand, a number of embodiments of the nozzles, exhaust tubes andsuction heads, designed in accordance with the invention, together withthe relevant parts of a spinning machine.

Figure 1 is a diagrammatic view of a known type of nozzle outlet withthe corresponding distribution of the lines of flow;

Figure 2 is a diagrammatic'view of the type of nozzle shown in Figure 1with the corresponding lines of constant suction strength in theirposition relatively to the fluted roller;

Figure 3 is a diagrammatic view of another type of nozzle outlet withthe corresponding distribution of the lines of flow;

Figure 4 is a diagrammatic view of the nozzle shown in Figure 3 with thecorresponding lines of constant suction strength in their positionrelatively to the fluted roller;

Figure 5 is a diagrammatic view of another type of nozzle outlet withthe corresponding distribution of the lines of flow;

Figure 6 is a diagrammatic view of the nozzle shown in Figure 5 with.the corresponding lines of constant suction strength in their positionrelatively to the fluted roller;

Figure 7 is a diagrammatic view of the nozzle aperture provided by thepresent invention with the corresponding distribution of the lines offlow;

Figure 8 is a diagrammatic view of the nozzle aperture shown in Figure 7with the corresponding lines of constant suction strength in theirposition relatively to the fluted roller;

Figure 9 is a diagrammatic view of a modified form of the nozzleaperture;

Figure 10 is a diagrammatic view of a modified embodiment of the nozzleaperture;

Figure 11 is a diagrammatic view of another modified form of the nozzleaperture;

Figure 12 is a view in side elevation of a drawing frame havingindividual exhaust tubes for the broken threads, such tubes beingprovided with the apertures of the present invention;

Figure 13 is a view in front elevation of the tram shown in Figure 12;

Figure 14 is a view in side elevation of a frame provided with anexhausting device, having a suction head and manifold;

Figure 15 is a view in front elevation of the device shown in Figure 14.

Figure 16 is a diagrammatic view of the exhaust tube and nozzle outletin their position relatively to the fluted roller and pressure roller ofa drawing frame;

Figure 17 is a view in side elevation of a modified suction head;

Figure 18 is a view partly in elevation and partly in section of thesuction head shown in Figure 17;

Figure 19 is a sectional view through a nozzle tube; and

Figure 20 is a sectional view through an exhaust tube provided with afitted-on outlet.

As shown in Figs. 1-6, the nozzle tubes of a thread exhausting device inspinning machines were hitherto normally provided with a nozzle outletof round or rectangular cross section 2, 3, 4, the latter being arrangedwith their longitudinal axis either transversely or parallel to thefluted roller (.1) of a drawing frame. The way in which the conditionsof flow and the direction and density of the threads 6 as well as thelines 7 of equal suction strength around the nozzles are distributedwill be seen in Figs. 1- 6 in comparison with corresponding arrangementsshown in Figs. 7 and 8 for the new triangular form 5 of an exhaustnozzle. At the same time Figs. 2, 4, 6 and 8 show how the exhaustingrange of the particular type of nozzle and arrangement lie in relationto the fluted roller. It will at once be apparent that a triangularnozzle according to Figs. 7 and 8 has the best and the most uniformeffect over the entire change width ofB of the fluted roller 1determined by the movements of the threads.

Within the scope of the basic triangular form of the nozzle outletaccording to the invention and whilst allowing for the particularconditions involved, special embodiments are possible as shown by way ofexample in Figs. 9-11. Some or all of the sides forming the triangle maybe rectilinear or, as shown by Figs. 9-11, some or all of the lines maybe curved or deflected slightly inwards or outwards.

According to the experience so far gained an isosceles triangle havingits apex turned towards the lower delivery roller of the drawing frameand rounded corner of the nozzle outlet, has proved particularlyadvantageous.

The said shape and arrangement is shown in Figs. 12 and 13 by way ofexample in an exhausting device in which each thread leaving the drawingframe, shown by the pair of rollers 11, 12 and 9, and the conveyor 0leathers 13, is provided with a separate suction tube 14 which isconnected in the known manner with the central duct or flue 15. Thenozzle outlet of the suction tube 14 is located below the fluted roller9 and is so arranged that the pressure roller 10 located obliquely aboveit is also within the range of the air circulation.

In the embodiment shown in Fig. 16, the suction tube 16 carrying thenozzle outlet according to the invention is provided with a recess 16'adapted to fit the peripheral curvature of the fluted roller 18. Inconsequence it is possible to arrange the nozzle outlet particularlyclose to the bite or nip formed between the fluted roller 18 and thepressure roller 19. The yarn 17 leaving the drawing frame is guided inknown manner past the nozzle outlet of the suction tube 16 and throughthe guide eyelet- 20. According to the construction of the spinningmachine, the same purpose can be achieved by suitably bending the entiretube.

The same figure also shows obliquity at the angle shown in the drawing,of the plane of the outlet relatively to the longitudinal axis of thesuction tube. All these measures contribute to improving the exhaustingaction within the range of a broken thread and also to a moreadvantageous air circulation round the drawing frame rollers.

The embodiment according to Figs. 14 and differs from those describedabove by the fact that in this case, an exhaust manifold 21 of known Tor L shape is provided, which leads to a central duct 23 and the suctionhead 21 of which consists of a tube arranged parallel to the drawingframe rollers. The said tube is shown here with a circular cross sectionbut it may equally well be given any other suitable shape. In any caseit is provided at suitable points for catching up and exhausting thebroken threads, with nozzle apertures 27 of the basic triangular shapeaccording to the invention. The drawing frame is represented in thisinstance by the pairs of rollers 25, 26 and 28, 29 through which theyarn 24 passes.

Particularly in those cases in which the clearing roller for the flutedroller is to be retained, it is expedient to resort to a differentdesign, of the above-mentioned suction heads. This is shown in Figs. 17and 18. In this case the nozzle outlets are not fitted in the head 30itself; on the contrary the latter carries a plurality of short suctionsockets 31 the nozzle outlet of which again exhibits the basictriangular shape according to the invention. The length, number andposition of these suction sockets depends upon the details of thespinning machine, of which the drawing shows the pair of deliveryrollers 33, 34 through which the yarn 32 passes, as well as the clearer35 for the fluted roller. The suction head 30 is connected, through theconnecting tube 36, in known manner with the central duct 37. Thesuction sockets 31 may be made interchangeable to enable them to beadapted to different grades of yarn. Moreover, these suction sockets maybe given a special internal shape as will be explained later and it maybe expedient in the case of a suction head having four or more suctionpoints, to design the suction sockets farthest away from the connectingtube 36 with an appropriate internal profile so as to ensure that aconstant quantity of air is exhausted at each suction point.

For reasons connected with manufacture and ease of flow, it is generallypreferable to impart a circular shape to the suction tubes 14 and 16.The transition from the triangular nozzle outlet to the round part ofthe tube is by no means a matterv of indifference. The shape of thistransition point evolved in accordance with the invention will bebriefly explained with the aid of Fig. 19. The inflow edges and theround corners a of the nozzle outlet on the suction tube 40 are roundedoutwards. This rounded portion is followed by a uniform relatively rapidtransition of the nozzle aperture to the round crosssection, the latter,however, being slightly smaller at b than the total cross section of thenozzle aperture proper at a. The narrowest point thus formed isfollowed, whilst retaining the round cross section, in continuoustransition by an expansion until the normal internal diameter of thesuction tube is reached at c.

This profile can be imparted to the suction tube itself or, as shown inFigure 20, to a special mouthpiece 39 fitted on the suction tube 38.This mouthpiece 39 is fitted over the suction tube. By interchanging itthe suction tube can be adapted to suit difierent requirements. Asuitably shaped mouthpiece 39 can, however, also be inserted eitherwholly or in part in the suction tube 38. The suction sockets 31illustrated in Fig. 18 can also be shaped to advantage in accordancewith the foregoing description.

By altering the shape of the mouthpiece 39 and in particular, as shownat d, by making more or less deep borings along the dotted line (shownin Figure 20) but not as far as the narrowest portion b, it is possibleto ensure, that the same quantities of air flow through the nozzleaperture, in spite of variations in the pressure. In this way it ispossible to ensure that the suction effect of the broken threadexhausting device is equal both in the case of the first and the lastspindles of a spinning machine, even if local differences in pressureexist in the central duct which traverses the entire spinning machineand to which the individual mouthpieces through the small tubes or thesuction heads are connected;

The above mentioned suction tubes and mouthpieccs may be made of anydesired material, for example, from cast or pressed metal or from acolored or transparent plastic material. They are suitable both forstationary suction tubes and suction heads as well as for those adaptedto move up and down or backwards and forwards as a function of theprogress of the thread. On account of their widthwise spread they mayalso be fitted with particular advantage in appropriate orifices orslots in clearing rollers.

I claim:

1. In an exhausting device for collecting lint and broken ends for usewith spinning frames and fly-frames having rollers, the combination of asuction head arranged adjacent the rollers and parallel to the axis ofthe frame, said suction head having at least one aperture arrangedopposite to a thread leavig the frame, the aperture exhibiting the basicshape of a triangle having the apex adjacent the rollers therebyensuring the optimum effect in breadth in regard to suction strength andair circulation round the frame rollers.

2. In an exhausting device for collecting lint and broken ends for usewith spinning frames and fly-frames having delivery rollers, thecombination of a plurality of suction tubes placed adjacent deliveryrollers of the frame, each suction tube having a nozzle apertureexhibiting the basic shape of a triangle having the apex adjacent therollers thereby ensuring the optimum effect in breadth in regard tosuction strength and air circulation round the frame rollers, the nozzleaperture in each suction tube being at the end thereof arranged oppositeto a thread leaving the frame.

3. An exhausting device according to claim 2 in which the nozzleaperture has inflow edges and rounded corners.

4. An exhausting device according to claim 2 in which the triangularcross section of the nozzle aperture merges inside the suction tube andin the direction of the flow of air into a round cross section of thesuction tube which is smaller than the cross section of the nozzleaperture, the suction tube increasing in internal diameter in thedirection of air flow from the round cross section until it reaches thenormal internal diameter of the suction tube.

5. An exhausting device according to claim 4 in which the suctionnozzles arranged on one side of a frame are adjusted to a uniformsuction effect at the triangular nozzle apertures by each suction tubehaving its zone of transition of a size to permit the same suction ineach tube.

6. An exhausting device according to claim 2 in which the nozzleaperture is placed obliquely to the longitudinal axis of the suctiontube.

7. An exhausting device according to claim 2 in which the suction tubeis provided adjacent the nozzle aperture with a recess in its sideturned toward the delivery roller of the frame.

8. An exhausting device according to claim 2 in which the suction nozzleaperture of the suction tube has two sides converging toward the lowerdelivery roller of the frame.

9. In combination with a spinning frame having delivery rollers, anexhaust device for collecting lint and broken ends, said exhaust deviceincluding means placed adjacent the delivery rollers of the frame, anexhausting member, said means being connected to the exhausting memberand at least one suction nozzle in said means having an apertureadjacent the delivery rollers of the frame which exhibits the basicshape of a triangle having the apex adjacent the rollers therebyensuring the optimum effect in breadth in regard to suction strength andair circulation round the frame rollers.

10. The combination, according to claim 9, in which the apex of thetriangle is turned toward the lower delivery roller of the frame.

11. The combination, according to claim 9, in which the nozzle aperturehas inflow edges and rounded corners.

12. The combination, according to claim 9, in which the triangular crosssection of the nozzle aperture merges inside said means and in thedirection of the flow of air into a round cross section, said roundcross section being smaller than the cross section of the nozzleaperture, the diameter of said means increasing from said round crosssection in the direction of air flow until it reaches a desired internaldiameter of said means.

13. The combination, according to claim 12, in which the variations inthe internal profile of the nozzle are incorporated in a removablemouthpiece.

14. A nozzle for an exhausting device for collecting lint and brokenends for use with spinning frames and fly frames having delivery rollershaving an aperture having corners and inflow edges, adapted to be placedadjacent the delivery rollers, said aperture having the shape of atriangle to ensure the optimum effect in breadth in regard to suctionstrength and air circulation round the frame rollers, the corners andinflow edges of the aperture being rounded.

15. A nozzle, according to claim 14, in which the triangular crosssection of the aperture merges inside the nozzle and in the direction ofthe flow of air into a round cross section, said round cross sectionbeing smaller than the cross section of the nozzle aperture, said roundcross section increasing in diameter in the direction of the flow of airuntil it reaches the desired internal diameter of the suction tube.

16. In an exhausting device for collecting lint and broken ends for usewith spinning and fly frames having delivery rollers, the combination ofa plurality of suction tubes placed adjacent delivery rollers of theframe, each suction tube having a removable mouthpiece attached thereto,each mouthpiece having an aperture exhibiting the basic shape of atriangle having the apex adjacent the rollers thereby ensuring theoptimum effect in breadth in regard to suction strength and aircirculation round the frame rollers, the aperture in each mouthpiecebeing at the end thereof arranged opposite to a thread leaving theframe, the triangular cross section of the mouthpiece aperture merginginside the mouthpiece and in the direction of the flow of air into around cross section of the mouthpiece which is smaller than the crosssection of the aperture, the mouthpiece increasing in internal diameterin the direction of air flow from the round cross section until itreaches the normal internal diameter of the mouthpiece, the mouthpiecesof suction tubes arranged on one side of a frame being adjusted to auniform suction effect at the triangular apertures by each mouthpiecehaving its zone of transition from the narrowest cross section to thenormal internal diameter shortened corresponding to the differences inpressure.

References Cited in the file of this patent UNITED STATES PATENTS2,522,250 Bechtler Sept. 12, 1950 2,572,138 Griset, Jr. Oct. 23, 19512,617,603 Griset, Jr. Nov. 11, 1952 FOREIGN PATENTS 266,333 SwitzerlandApr. 17, 1950

